foster



(No Model.) 2 SheetsSheet 1.

1 A.- W. POSTER.

MACHINE FOR DRAWING METAL.

No. 527,486. Patented Oct. 16, 1894 ,(No Model.) 2 Sheets-'-Sheet 2.

A. W. FOSTER. MACHINE FOR DRAWING METAL.

No. 527,486. Patented 001;. 16, 1894.

UNITED STATES 1 PATENT OFFICE ALEXANDER w. FoSrER,oE PITTSBURG, PENNSYLVANIA, ASSIGNOR .To THE SINGER, 'NIMICK & ooMPANY, LIMITED, or SAME PLACE.

MACHINE FOR DRAWING METAL.

sPEcI IcATIoN forming part of Letters Patent 'No. 527,486, dated October Application filed June 12,1894. Serial No. 514,290. (No model.)

exact description thereof.

My invention relates to machines for drawing rods, bars and tubes, its object being to provide a machine in which the rod can be handled in a comparatively small space, that is, in a space but little longer than its own length instead'of requiring a space practically double the length of the rod and in which the rod can be inserted in the drawing die so as to be grasped by the gripper without having its end previously reduced.

To these ends my invention comprises, generally stated, a draw-bench having a station-.

ary gripper at one end thereof, supported di rectly n the draw-bench, a drawing-die travcling on-the said draw-bench and a traveling gripper in line with the drawing die by which the rod can be grasped, and by movement between such gripper and drawing-die be forced through the drawing-die so as to be subsequently caught by the stationary gripper on the draw-bench and held while the drawingdie is drawn along the tube which isheld from longitudinal movement.

ments as will be hereinafter described and It also-consists in combining with the Stationary gripper on the bench, a buggy having i 1 the drawing die secured thereto and the pusha for holding the pushing gripperifrom longiing gripper sliding on thebuggy, and means tudinal movement so thatthe rod can be graspedby the pushing gripper and through the movement of the buggythe drawing diel be drawn over the rod, while the pushing gripper is held stationary, and bytheadvancement of the buggy the rod canbe carried into. the stationary gripper and grasped thereby,

and in the subsequent drawing operationthe rod passed through both the pushing gripper and drawing die. A r r l i It also consists in certain other improveclaimed.

To enable others skilled in the art to make and use my invention, I will describe the same i more fully, referring to the accompanying drawings, in whicht Figure 1 is aside view ofthe end of the bench carrying the fixed die, showing all the operative mechanism of the draw-bench, the part of the bench notshown being simply an extension of the track and the chain and its supporting sprocket, which it is not deemed necessary to illustrate. Fig. 2 is a plan view showing the dies and grippers in section, and

showing the bar or rod held in the pushing gripper and just entering the drawing die. Fig. 3is alike View. showing the rod forced through the drawing die. Fig. 4 is a like view showing the rod carriedforward and entered into the stationary gripper. Fig. 5 is an end view of the machine, and Figs. 6, 7, 8 and 9 are detail views of thegripping mechanism. Like letters of reference indicate like parts in each of the views.

Thedraw-bench A may be of any suitable construction and has mounted therein the draw-chainawhich is shown as passing around.

the sprocket I) mounted in the draw-bench, it being understood that the chain is mounted on a like sprocket at the opposite end which. is driven by any suitable power connections. The draw-bench has the track 0 extendingfor the full lengththereof on which is mounted the buggy d, having the wheels d traveling on the track 0 and also having the hook d which can be inserted in the drawing chain o to givethe necessary power for the operation hereinafter described and to draw the buggy along the track. At the forward end fofthe draw-bench is the stationary grippers which is firmly secured to the draw-bench and is adapted to grasp or grip the rod fwhen iinserted therein as hereinafter described. Secured upon the buggy d is the drawing-die g which fits in a die seat g. forming part of the buggy, it being, of course, understood. that the dies are removablefrom thedie seat,

so that dies of difierent sizesmaybe inserted therein. Mounted to slide on. the buggy dis the gripper frame it which carries the pushing gripper h, the buggy being made of suificient length to permit a longitudinal movement between the pushing gripper and drawing die the draw-bench and has arms l fitting in recesses in the lower ends of the sliding bars Z so that by the movement of the lever 10 the.

sliding bars may be raised above the top surface of the tracks 0 of the draw-bench and into the course of the gripper frame h so that saidgripper frame will be held stationary by striking against said sliding bars or stops.

The operation of the machine in its general nature; as .included in the above description, is as follows: The rod, bar or tube f to be drawn is placed upon the draw-bench and itsend inserted into the pushing gripper h i when the same is opened, and is passed forward until its end reaches the drawing die g, when the gripper h is closed and grips or holds the rod. The movement of the drawing chain is controlled by suitable mechanism so that it may be started and stopped.

as desired, and the operator with the lever is raises the stops Z into the course of the gripper frame h and inserts the hook d of the buggy into the chain and starts the chain which acts to pull back the buggy, while the pushing gripper and its frame are held stationary by the stops Z, and so forces or pushes the rod held by the gripper through the drawing die 9 and causes it to project beyond the same as shown in Fig. 3. When the drawing die is drawn close to the gripper h the machine is stopped and the stops Z are lowered out of the course of the gripper frame 72/, and the gripper h is opened so as to permit the free movement of the bar through the same. The buggy is then pushed forward so that the end of the rod enters the stationary gripper e, and that gripper is then closed so as to grip the rod and hold it. The hook 121 is then insorted in the drawing chain a, and the said chainstarted so that itdraws back the drawing die along the rod f while it is held stationary by the stationary gripper e, the rod being in this way held stationary while the drawing die travels along the rod, and this continues until the drawing operation is completed, and the drawing die drawn ofi the rod while it is held in the gripper. essary then to open the stationary gripper and remove the rod, pass the buggy to the forward end of the machine and repeat the operation.

It will be seen in this operation that the rod to be drawn is moved only a short distance longitudinally and may be carried to the It is only necdrawing frame laterally or from the side thereof and entered into the pushing gripper, and that it is only necessary for the machine to be of the length greater than the rod corresponding to the amount of longitudinal movement to be given to the rod before it is caught by the stationary gripper, this being of importance as it saves space in the factory and does away with the necessity of the occupation of a long space at the end of the machine for the handling of the rod to be drawn.

The form of gripping device preferred to be used by me is as stated above, illustrated in Figs. 6 to 9, and in several of the figures of the draw-bench. Where the gripper is formed of two gripping jaws having tapering cylindrical outer surfaces moving within a tapering cylindrical seat, difficulty is experienced because such cylindrical faces of the jaws and the seat therefor will not con form perfectly with each other in different positions, and the seat will either bind upon the jaws in the center thereof, or at the outer ends so causing the grippingaction practicallybetween two points of the gripping jaws instead of all around the jaw faces. For this reason it is found desirable to employ the gripping jaws with tapering fiat faces connected by angles as shown in the several figures, and provide the seat with like tapering faces, so that these faces both of the jaws and of the seat for the jaws can bear upon each other in such way as to maintain the hold entirely around or for the greater part of the gripping faces of the jaws. The gripping jaws are shown at m and they fit in the jaw seat nbneither the draw-bench or the gripping frame above referred to. noticed that the outer faces of the gripping jaws m are both inclined and composed of a series of flat faces connected by angles, there being the central flat faces m, the side flat,

faces m and the end flat faces m The jaw seat n has flat faces corresponding in incline or taper to .the faces of the jaws, but having the projecting incline faces n adapted to contact with the side faces m of the jaws, while between such projecting inclined faces at are the depressions m the result of which is that when the jaws slide in the jaw seat their incline faces 71. bear against the projecting inclined faces n, while the remainder of the jaw faces are free on account of the depressions n in the jaw seat. As the jaws slide in the jaw seats and the relative positions of the inclines change with relation to each other as is necessary, the edges of the inclined faces m of the jaws may pass beyond the projecting inclined faces it into the depressions n so that there is a bearing of straight or flat inclined faces against each other and the pressure from the jaw seat to the jaws is al-.

It will be,

r I p in the other which always holds them in projecting inclined faces n'of the jaw seat which prevents the spreading of the jaws naturally brought upon the jaws, and sustains sustaining the pressure on the jaws at the two points at which the greatest strain is ing thepressure of the jaw faces around the 1 rod at practically allpoints and always in the same lines, instead of having a variation n in the points of support which would occur inthe ordinary taperingcylindrical jaws and jaw seat.

The jaws m are connected together by the projection 13 in one jaw fitting in the recess proper line with each othergand they may be I moved in the jaw seat in any way desired,

. i U for example, by means of a rack bar 0" extending out at the end of one of the jaws which engages with arack lever r mounted on the gripper in any suitable way. The

1 jaws are also illustrated as having the linings j is which can be changed at pleasure according to the size of the rod or tube to be drawn and replaced in case of wear.

The linings of the stationary grippers are shown with inwardly projecting ribs s which form stops to prevent the rod or bar from passing through the gripper. The linings of the pushing gripper h are of practically the same diameterthroughout so as to permit the passage of the rod through the same.

What I claim as my invention, and desire to secure by Letters Patent, isn 1. The combination with a fixed gripper of a traveling drawing die, and a pushing gripper adapted to force the rod through the traveling drawing die, substantially as set forth.

2. The combination of a fixed gripper, a

traveling drawing die, a pushing gripper and I stop mechanism for holding such pushing gripper stationary during the movement of 1 i the drawing die, substantially as set forth.

3. The combination of a fixed gripper, a

buggy carrying a traveling drawing die, a pushing gripper mounted to slide on the buggy, and stop mechanism engaging with the pushing gripper, substantially as set forth.

4. The combination of a drawing frame having a buggy traveling thereon, a drawing die carried by the buggy, a pushing gripper in line with the drawing die and stops on the bench adapted to engage with the pushing gripper, substantially as set forth.

5. The combination of a drawing bench, a drawing chain traveling therein, a buggy adapted to engagewith the drawing chain and having a drawing die thereon, a pushing gripper mounted to slide on the buggy and vertically movable stops mounted on the drawing bench and adapted to engage with the pushing gripper, substantially as set forth.

6. The combination of a drawing bench, a buggy traveling thereon, and carryinga drawing die, a gripper frame sliding on the bugg and extending beyond the draw-bench and carrying a gripper in line with the drawingdie, and vertically movable stops mounted in the draw-bench beyond the track thereof, and adapted to engage with the gripper frame, substantially as set forth.

7. In a gripping die, the combination of a gripper or jaw seat having four or more flat tapering faces therein at angles to each other, of two gripping jaws fitting in said seat, each having two or more flat tapering outer faces engaging with like faces in the jaw seat, substantially as set forth.

8. The combination of a gripper or jaw seat having four or more flat tapering faces projecting inwardly therefrom, and recesses between said faces, of two gripping jaws fitting in said seat, each having two or more fiat tapering outer faces adapted to engage with the projecting faces of the gripper seat, substantially as set forth.

In testimony whereof I, the said ALEXAN- DER W. FOSTER, have hereunto set my hand.

ALEXANDER W. FOSTER.

Witnesses: JAMEs I. KAY, ROBERT C. TQTTEN. 

